Synthesis and fungicidal activity of novel imidazole-based ketene dithioacetals

Publication date: Available online 9 March 2018
Source:Bioorganic & Medicinal Chemistry
Author(s): Stephane Jeanmart, Julien Gagnepain, Pulakesh Maity, Clemens Lamberth, Fredrik Cederbaum, Ramya Rajan, Olivier Jacob, Mathias Blum, Stephane Bieri
Novel imidazole-based ketene dithioacetals show impressive in planta activity against the economically important plant pathogens Alternaria solani, Botryotinia fuckeliana, Erysiphe necator and Zymoseptoria tritici. Especially derivatives of the topical antifungal lanoconazole, which bear an alkynyloxy or a heteroaryl group in the para-position of the phenyl ring, exhibit excellent control of the mentioned phytopathogens. These compounds inhibit 14α -demethylase in the sterol biosynthesis pathway of the fungi. Synthesis routes starting from either benzaldehydes or acetophenones as well as structure-activity relationships are discussed in detail.

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